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Developments in Polarization and Energy Control of APPLE-II Undulators at Diamond Light Source

DOI: 10.1088/1742-6596/425/3/032011 DOI Help

Authors: Emily Longhi (Diamond Light Source) , Peter Bencok (Diamond Light Source) , A. Dobrynin (Diamond Light Source) , E C M Rial (Diamond Light Source) , Austen Rose (Diamond Light Source) , Paul Steadman (Diamond Light Source) , C Thompson (Diamond Light Source) , A Thomson (Diamond Light Source) , Hongchang Wang (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Conference Series , VOL 425

State: Published (Approved)
Published: March 2013

Abstract: A pair of 2m long APPLE-II type undulators have been built for the I10 BLADE beamline at Diamond Light Source. These 48mm period devices have gap as well as four moveable phase axes which provide the possibility to produce the full range of elliptical polarizations as well as linear polarization tilted through a full 180deg. The mechanical layout chosen has a 'master and slave' arrangement of the phase axes on the top and bottom. This arrangement allows the use of symmetries to provide operational ease for both changing energy using only the master phase while keeping fixed linear horizontal or circular polarization, as well as changing linear polarization angle while keeping fixed energy [1]. The design allows very fast motion of the master phase arrays, without sacrifice of accuracy, allowing the possibility of mechanical polarization switching at 1Hz for dichroism experiments. We present the mechanical design features of these devices, as well as the results of magnetic measurements and shimming from before installation. Finally, we present the results of characterization of these devices by the beamline, including polarimetry, which has been done on the various modes of motion to control energy and polarization. These modes of operation have been available to users since 2011.

Journal Keywords: Accuracy; Design; Diamonds; Dichroism; Installation; Light Sources; Operation; Polarimetry; Polarization; Synchrotron Radiation Sources; Wiggler Magnets

Subject Areas: Technique Development, Physics

Technical Areas: Insertion Devices